Buggy code:
public boolean insert_space_before_comma_in_type_parameters ; public boolean insert_space_before_ellipsis ; public boolean insert_space_before_parenthesized_expression_in_return ; public boolean insert_space_before_question_in_wilcard ; public boolean insert_space_before_opening_angle_bracket_in_parameterized_type_reference ; public boolean insert_space_before_opening_angle_bracket_in_type_arguments ; public boolean insert_space_before_opening_angle_bracket_in_type_parameters ; public boolean insert_space_before_opening_brace_in_annotation_type_declaration ; public boolean insert_space_before_opening_brace_in_anonymous_type_declaration ; public boolean insert_space_before_opening_brace_in_array_initializer ; public boolean insert_space_before_opening_brace_in_block ; public boolean insert_space_before_opening_brace_in_constructor_declaration ; public boolean insert_space_before_opening_brace_in_enum_constant ; public boolean insert_space_before_opening_brace_in_enum_declaration ; public boolean insert_space_before_opening_brace_in_method_declaration ; public boolean insert_space_before_opening_brace_in_type_declaration ; public boolean insert_space_before_opening_bracket_in_array_allocation_expression ; public boolean insert_space_before_opening_bracket_in_array_reference ; public boolean insert_space_before_opening_bracket_in_array_type_reference ; public boolean insert_space_before_opening_paren_in_annotation ; public boolean insert_space_before_opening_paren_in_annotation_type_member_declaration ; public boolean insert_space_before_opening_paren_in_catch ; public boolean insert_space_before_opening_paren_in_constructor_declaration ; public boolean insert_space_before_opening_paren_in_enum_constant ; public boolean insert_space_before_opening_paren_in_for ; public boolean insert_space_before_opening_paren_in_if ; public boolean insert_space_before_opening_paren_in_method_invocation ; public boolean insert_space_before_opening_paren_in_method_declaration ; public boolean insert_space_before_opening_paren_in_switch ; public boolean insert_space_before_opening_brace_in_switch ; public boolean insert_space_before_opening_paren_in_synchronized ; public boolean insert_space_before_opening_paren_in_parenthesized_expression ; public boolean insert_space_before_opening_paren_in_while ; public boolean insert_space_before_postfix_operator ; public boolean insert_space_before_prefix_operator ; public boolean insert_space_before_question_in_conditional ; public boolean insert_space_before_semicolon ; public boolean insert_space_before_semicolon_in_for ; public boolean insert_space_before_unary_operator ; public boolean insert_space_between_brackets_in_array_type_reference ; public boolean insert_space_between_empty_braces_in_array_initializer ; public boolean insert_space_between_empty_brackets_in_array_allocation_expression ; public boolean insert_space_between_empty_parens_in_annotation_type_member_declaration ; public boolean insert_space_between_empty_parens_in_constructor_declaration ; public boolean insert_space_between_empty_parens_in_enum_constant ; public boolean insert_space_between_empty_parens_in_method_declaration ; public boolean insert_space_between_empty_parens_in_method_invocation ; public boolean compact_else_if ; public boolean keep_guardian_clause_on_one_line ; public boolean keep_else_statement_on_same_line ; public boolean keep_empty_array_initializer_on_one_line ; public boolean keep_simple_if_on_one_line ; public boolean keep_then_statement_on_same_line ; public int number_of_empty_lines_to_preserve ; public boolean put_empty_statement_on_new_line ; public int tab_size ; public final char filling_space = '<seq2seq4repair_space>' ; public int page_width ; public int tab_char ; public boolean use_tabs_only_for_leading_indentations ; public int initial_indentation_level ; public String line_separator ; private DefaultCodeFormatterOptions ( ) { } public DefaultCodeFormatterOptions ( Map settings ) { } private String getAlignment ( int alignment ) { } public Map getMap ( ) { } public void set ( Map settings ) { } public void setDefaultSettings ( ) { } public void setEclipseDefaultSettings ( ) { } public void setJavaConventionsSettings ( ) { this . alignment_for_arguments_in_allocation_expression = Alignment . M_COMPACT_SPLIT ; this . alignment_for_arguments_in_enum_constant = Alignment . M_COMPACT_SPLIT ; this . alignment_for_arguments_in_explicit_constructor_call = Alignment . M_COMPACT_SPLIT ; this . alignment_for_arguments_in_method_invocation = Alignment . M_COMPACT_SPLIT ; this . alignment_for_arguments_in_qualified_allocation_expression = Alignment . M_COMPACT_SPLIT ; this . alignment_for_assignment = Alignment . M_NO_ALIGNMENT ; this . alignment_for_binary_expression = Alignment . M_COMPACT_SPLIT ; this . alignment_for_compact_if = Alignment . M_COMPACT_SPLIT ; this . alignment_for_conditional_expression = Alignment . M_NEXT_PER_LINE_SPLIT ; this . alignment_for_enum_constants = Alignment . NONE ; this . alignment_for_expressions_in_array_initializer = Alignment . M_COMPACT_SPLIT ; this . alignment_for_multiple_fields = Alignment . M_COMPACT_SPLIT ; this . alignment_for_parameters_in_constructor_declaration = Alignment . M_COMPACT_SPLIT ; this . alignment_for_parameters_in_method_declaration = Alignment . M_COMPACT_SPLIT ; this . alignment_for_selector_in_method_invocation = Alignment . M_COMPACT_SPLIT ; this . alignment_for_superclass_in_type_declaration = Alignment . M_COMPACT_SPLIT ; this . alignment_for_superinterfaces_in_enum_declaration = Alignment . M_COMPACT_SPLIT ; this . alignment_for_superinterfaces_in_type_declaration = Alignment . M_COMPACT_SPLIT ; this . alignment_for_throws_clause_in_constructor_declaration = Alignment . M_COMPACT_SPLIT ; this . alignment_for_throws_clause_in_method_declaration = Alignment . M_COMPACT_SPLIT ; this . align_type_members_on_columns = false ; this . brace_position_for_annotation_type_declaration = DefaultCodeFormatterConstants . END_OF_LINE ; this . brace_position_for_anonymous_type_declaration = DefaultCodeFormatterConstants . END_OF_LINE ; this . brace_position_for_array_initializer = DefaultCodeFormatterConstants . END_OF_LINE ; this . brace_position_for_block = DefaultCodeFormatterConstants . END_OF_LINE ; this . brace_position_for_block_in_case = DefaultCodeFormatterConstants . END_OF_LINE ; this . brace_position_for_constructor_declaration = DefaultCodeFormatterConstants . END_OF_LINE ; this . brace_position_for_enum_constant = DefaultCodeFormatterConstants . END_OF_LINE ; this . brace_position_for_enum_declaration = DefaultCodeFormatterConstants . END_OF_LINE ; this . brace_position_for_method_declaration = DefaultCodeFormatterConstants . END_OF_LINE ; this . brace_position_for_type_declaration = DefaultCodeFormatterConstants . END_OF_LINE ; this . brace_position_for_switch = DefaultCodeFormatterConstants . END_OF_LINE ; this . comment_clear_blank_lines = false ; this . comment_format = true ; this . comment_format_header = false ; this . comment_format_html = true ; this . comment_format_source = true ; this . comment_indent_parameter_description = true ; this . comment_indent_root_tags = true ; this . comment_insert_empty_line_before_root_tags = true ; this . comment_insert_new_line_for_parameter = true ; this . comment_line_length = 80 ; this . continuation_indentation = 2 ; this . continuation_indentation_for_array_initializer = 2 ; this . blank_lines_after_imports = 1 ; this . blank_lines_after_package = 1 ; <START_BUG> this . blank_lines_before_field = 1 ; <END_BUG> this . blank_lines_before_first_class_body_declaration = 0 ; this . blank_lines_before_imports = 1 ; this . blank_lines_before_member_type = 1 ; this . blank_lines_before_method = 1 ; this . blank_lines_before_new_chunk = 1 ; this . blank_lines_before_package = 0 ; this . blank_lines_between_type_declarations = 1 ; this . blank_lines_at_beginning_of_method_body = 0 ; this . indent_statements_compare_to_block = true ; this . indent_statements_compare_to_body = true ; this . indent_body_declarations_compare_to_annotation_declaration_header = true ; this . indent_body_declarations_compare_to_enum_constant_header = true ; this . indent_body_declarations_compare_to_enum_declaration_header = true ; this . indent_body_declarations_compare_to_type_header = true ; this . indent_breaks_compare_to_cases = true ; this . indent_empty_lines = false ; this . indent_switchstatements_compare_to_cases = true ; this . indent_switchstatements_compare_to_switch = false ; this . indentation_size = 4 ; this . insert_new_line_after_annotation = true ; this . insert_new_line_after_opening_brace_in_array_initializer = false ; this . insert_new_line_at_end_of_file_if_missing = false ; this . insert_new_line_before_catch_in_try_statement = false ; this . insert_new_line_before_closing_brace_in_array_initializer = false ; this . insert_new_line_before_else_in_if_statement = false ; this . insert_new_line_before_finally_in_try_statement = false ; this . insert_new_line_before_while_in_do_statement = false ; this . insert_new_line_in_empty_anonymous_type_declaration = true ; this . insert_new_line_in_empty_block = true ; this . insert_new_line_in_empty_annotation_declaration = true ; this . insert_new_line_in_empty_enum_constant = true ; this . insert_new_line_in_empty_enum_declaration = true ; this . insert_new_line_in_empty_method_body = true ; this . insert_new_line_in_empty_type_declaration = true ; this . insert_space_after_and_in_type_parameter = true ; this . insert_space_after_assignment_operator = true ; this . insert_space_after_at_in_annotation = false ; this . insert_space_after_at_in_annotation_type_declaration = false ; this . insert_space_after_binary_operator = true ; this . insert_space_after_closing_angle_bracket_in_type_arguments = true ; this . insert_space_after_closing_angle_bracket_in_type_parameters = true ; this . insert_space_after_closing_paren_in_cast = true ; this . insert_space_after_closing_brace_in_block = true ; this . insert_space_after_colon_in_assert = true ; this . insert_space_after_colon_in_case = true ; this . insert_space_after_colon_in_conditional = true ; this . insert_space_after_colon_in_for = true ; this . insert_space_after_colon_in_labeled_statement = true ; this . insert_space_after_comma_in_allocation_expression = true ; this . insert_space_after_comma_in_annotation = true ; this . insert_space_after_comma_in_array_initializer = true ; this . insert_space_after_comma_in_constructor_declaration_parameters = true ; this . insert_space_after_comma_in_constructor_declaration_throws = true ; this . insert_space_after_comma_in_enum_constant_arguments = true ; this . insert_space_after_comma_in_enum_declarations = true ; this . insert_space_after_comma_in_explicit_constructor_call_arguments = true ; this . insert_space_after_comma_in_for_increments = true ;

Fix:
this . blank_lines_before_field = 0 ;